A method for anti-condensation at an air conditioner radiation terminal includes transferring dehumidification heat in a fresh air ventilator to a refrigerant in a refrigerant tube via a plate heat exchanger in the fresh air ventilator to heat up the refrigerant and starting a pump in a cold and heat source. The pump drives the heat-exchanged and heated-up refrigerant to radiation terminals through the refrigerant tube, to implement anti-condensation. The dehumidification heat is heat that is absorbed when a heat exchanger performs refrigeration to dehumidify air.